The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1991
Filed:
Dec. 16, 1985
Robert L Eisenhart, Woodland Hills, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A loadline bias circuit for biasing solid state devices operable at high frequencies is disclosed. The source impedance of the dc bias circuit is adjusted to influence the RF device characteristic, thereby creating a way to optimize the device performance. The bias circuit comprises a resistive element coupled in series connection with a constant voltage source or in parallel connection with a constant current source. The bias circuit may be adapted to set an optimum relationship between the bias current and bias voltage so that when one bias parameter changes, the other will automatically compensate with an appropriate change as well. The resistive element provides a device operating range throughout which the bias power supplied to the device is substantially constant. The value of the loadline, that is, the resistive element, can be selected to optimize particular performance parameters.